--- a/devtools/client/memory/components/tree-map/canvas-utils.js
+++ b/devtools/client/memory/components/tree-map/canvas-utils.js
@@ -11,17 +11,17 @@
  * canvas. The main canvas dimensions match the parent div, but the CSS can be
  * transformed to be zoomed and dragged around (potentially creating a blurry
  * canvas once zoomed in). The zoom canvas is a zoomed in section that matches
  * the parent div's dimensions and is kept in place through CSS. A zoomed in
  * view of the visualization is drawn onto this canvas, providing a crisp zoomed
  * in view of the tree map.
  */
 const { debounce } = require("devtools/shared/debounce");
-const EventEmitter = require("devtools/shared/old-event-emitter");
+const EventEmitter = require("devtools/shared/event-emitter");
 
 const HTML_NS = "http://www.w3.org/1999/xhtml";
 const FULLSCREEN_STYLE = {
   width: "100%",
   height: "100%",
   position: "absolute",
 };
 

--- a/devtools/client/memory/components/tree-map/drag-zoom.js
+++ b/devtools/client/memory/components/tree-map/drag-zoom.js
@@ -1,17 +1,17 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 "use strict";
 
 const { debounce } = require("devtools/shared/debounce");
 const { lerp } = require("devtools/client/memory/utils");
-const EventEmitter = require("devtools/shared/old-event-emitter");
+const EventEmitter = require("devtools/shared/event-emitter");
 
 const LERP_SPEED = 0.5;
 const ZOOM_SPEED = 0.01;
 const TRANSLATE_EPSILON = 1;
 const ZOOM_EPSILON = 0.001;
 const LINE_SCROLL_MODE = 1;
 const SCROLL_LINE_SIZE = 15;
 

--- a/devtools/client/memory/panel.js
+++ b/devtools/client/memory/panel.js
@@ -1,15 +1,15 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 "use strict";
 
-const EventEmitter = require("devtools/shared/old-event-emitter");
+const EventEmitter = require("devtools/shared/event-emitter");
 const { MemoryFront } = require("devtools/shared/fronts/memory");
 const HeapAnalysesClient = require("devtools/shared/heapsnapshot/HeapAnalysesClient");
 
 function MemoryPanel(iframeWindow, toolbox) {
   this.panelWin = iframeWindow;
   this._toolbox = toolbox;
 
   EventEmitter.decorate(this);